How many machine cycles will CPU take to complete the following:

39+40+12+75-68

Write the program then count the opcode cycles. Simple.

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Since you know the inputs beforehand and the result fits in a single byte without overflowing, you can do it with a half-dozen 2-clock instructions, for a total of 12 clocks (or T-states), which is only one machine cycle on some processors. That's one microsecond at 12MHz.